after so long time of testing the 7900GRE. i was able to achieve such a great stable OC
min frequency (MHz)=500
Max frequency (MHz) =2803
Voltage(mV)=950
Vram with fast timing at (MHz) =2400
power tuning= +15
in crimson diseart it got a stable 100 fps in cinematic settings+ RT
in 1080p
and here some benchmarks if u want to copy it
and thank you. please share this to your friends how have the same GPU